[fix][test] Fix flaky test testSplitBundleForMultiTimes.

[Technoboy-]

Fixed #16561, #18069

Motivation

Error:  Tests run: 52, Failures: 1, Errors: 0, Skipped: 27, Time elapsed: 353.204 s <<< FAILURE! - in org.apache.pulsar.broker.admin.NamespacesTest
  Error:  testSplitBundleForMultiTimes(org.apache.pulsar.broker.admin.NamespacesTest)  Time elapsed: 0.326 s  <<< FAILURE!
  org.apache.pulsar.client.admin.PulsarAdminException$ServerSideErrorException: 
  
   --- An unexpected error occurred in the server ---
  
  Message: Namespace bundle my-tenant/namespace-86da66f1-e68d-480a-b5bb-9f78a2f52fc9/0x00000000_0x08000000 is being unloaded
  
  Stacktrace:
  
  java.lang.IllegalStateException: Namespace bundle my-tenant/namespace-86da66f1-e68d-480a-b5bb-9f78a2f52fc9/0x00000000_0x08000000 is being unloaded
  	at org.apache.pulsar.broker.namespace.NamespaceService.lambda$findBrokerServiceUrl$9(NamespaceService.java:419)

https://github.com/apache/pulsar/actions/runs/3216911154/jobs/5275209470

Related pr : #17797

Documentation

• doc-not-needed

Matching PR in forked repository

PR in forked repository: https://github.com/Technoboy-/pulsar/pull/10

[mattisonchao]

LGTM, but I'm considering if some PRs break this test. have you seen it before?
Does it relate to this PR? #17797

[Technoboy-]

LGTM, but I'm considering if some PRs break this test. have you seen it before? Does it relate to this PR? #17797

yes, right. I will update it to the motivation.